List questions from algebraic-topology

Published on 25 Mar 2026 - 23:28

92

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Stiefel Whitney classes on the simplex or the simplicial complex

Published on 25 Mar 2026 - 12:46

86

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Another representation of $S^n$ as a quotient of disk

Published on 28 Mar 2026 - 11:34

461

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How to prove a Möbius band is not equivalent to a band

Published on 09 Oct 2018 - 4:11

744

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Can closed unit ball be a retract of unit sphere?

Published on 23 Feb 2026 - 2:56

356

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Basis of the fundamental group of a connected graph

Published on 25 Mar 2026 - 22:04

610

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What does 'copy' mean in topology?

Published on 09 Oct 2018 - 9:15

155

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Is the converse of this is true?

Published on 25 Mar 2026 - 17:39

907

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What is the cellular homology of a CW complex $X$ from long exact sequence of relative homology?

Published on 25 Mar 2026 - 6:13

1.4k

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Surjectivity of a continuous map implies surjectivity on $\pi_1$

Published on 26 Mar 2026 - 8:15

331

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How to prove that the symmetric product $SP^{n}(\mathbb{C})$ of the complex plane $\mathbb{C}$ is homeomorphic to $\mathbb{C}^{n}$.

Published on 10 Oct 2018 - 13:18

64

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In a CW complex, what is the closure of a cell $e_{\alpha}^n$?

Published on 25 Mar 2026 - 7:47

44

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The fundamental group of a half disk ( a neighborhood of a boundary point) can't be detected

Published on 25 Mar 2026 - 23:42

66

Views

topology of projectivised bundles in high dimensions.

Published on 28 Mar 2026 - 6:00

160

Views

Antipodal mapping $f:S^n\to S^1$

Published on 10 Oct 2018 - 22:15

List Question

Homeomorphisms of the 2-sphere $S^2$ fixing a set of points.

Stiefel Whitney classes on the simplex or the simplicial complex

Another representation of $S^n$ as a quotient of disk

How to prove a Möbius band is not equivalent to a band

Can closed unit ball be a retract of unit sphere?

Basis of the fundamental group of a connected graph

What does 'copy' mean in topology?

Is the converse of this is true?

What is the cellular homology of a CW complex $X$ from long exact sequence of relative homology?

Surjectivity of a continuous map implies surjectivity on $\pi_1$

How to prove that the symmetric product $SP^{n}(\mathbb{C})$ of the complex plane $\mathbb{C}$ is homeomorphic to $\mathbb{C}^{n}$.

In a CW complex, what is the closure of a cell $e_{\alpha}^n$?

The fundamental group of a half disk ( a neighborhood of a boundary point) can't be detected

topology of projectivised bundles in high dimensions.

Antipodal mapping $f:S^n\to S^1$

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